没有匹配的构造函数，用于"std :: thread"的初始化 [英] no matching constructor for initialization of 'std::thread'

问题描述

我一直在研究一个相当简单的工具:并发的 for 循环结构，该结构接受输入元素的列表，输出向量以及从输入元素中计算输出元素的函数.

I have been working on a rather simple facility: a concurrent for loop construct that takes a list of input elements, an output vector, and a function that computes output elements out of input elements.

我有一个无法编译的代码段:

I have this snippet that does not compile:

            template<class In, class Out>
            void thread_do(net::coderodde::concurrent::queue<In>& input_queue,
                           Out (*process)(In in),
                           std::vector<Out>& output_vector)
            {
                // Pop the queue, process, and save result.
                ...
            }


                for (unsigned i = 0; i < thread_count; ++i) 
                {
                    thread_vector.push_back(std::thread(thread_do, 
                                                        input_queue,
                                                        process,
                                                        output_vector));
                }

我使用 -std=c++14 .

I use -std=c++14.

./concurrent.h:129:45: error: no matching constructor for initialization of 'std::thread'
                    thread_vector.push_back(std::thread(thread_do, 
                                            ^           ~~~~~~~~~~

但是，我不知道如何解决它.尝试在 & 之前添加 thread_do /添加 <In, Out> ，但无济于事.

However, I have no idea how to fix it. Tried to prepend & to the thread_do/appending <In, Out>, yet no to avail.

推荐答案

您需要实例化函数:

thread_vector.push_back(std::thread(thread_do<In, Out>,     // you need to instantiate your template function 
                                    std::ref(input_queue),  // pass parameters by ref 
                                    std::ref(process),      // - // -
                                    std::ref(output_vector))// - // -
                                    );

这篇关于没有匹配的构造函数，用于"std :: thread"的初始化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！